import java.util.*;
 public class Example3_9{
  public static void main(String args[]){
   Scanner reader =new Scanner(System.in);
   double sum=0;
   int m=0;
   while(reader.hasNextDouble()){
     double x=reader.nextDouble();
     m=m+1;
     sum=sum+x;
  }
  System.out.printf("%d个数的和为%f\n",m,sum);
  System.out.printf("%d个数的平均值是%f\n",m,sum/m);
}
}
